The boost driver upgrade is available for the quad version of XP-L HI, SST-20, Osram W1/W2, Nichia 219B R9080 versions, each LED receives 2A current. The driver is not compatible with Nichia E21A, Nichia E17A, and mule versions of the flashlight.
Please be noted that the boost driver version will have less output on turbo than the regular version, it is a more efficient driver(90-95%) with longer running time and less heat. Emisar D4V2 puts a high lumen output but generates a lot of heat at the same time, please acknowledge before purchasing. Unprotected, flat top battery works only (not included in the price), D4V2 does not work with protected battery. D4V2 Brass reflashing kit purchase link Features: • CNC machined from Brass. • Efficient UK made Carclo Quad LED optics • Anti-reflective coated glass lens • Unihead construction • High lumen output and low moon output • Ramping interface • Electronic soft touch switch • Beryllium-Copper springs with 45% IACS superior to stainless steel alloys used for springs with only 2% IACS. • Temperature step-down • Waterproof and dustproof to IP67 standard (up to 1 meter) • Default 18650 body with optional 18350 battery tube • Dimensions: 96mm(length) * 28mm(head) * 24mm(body), 65mm(lenght 18350) OTF lumen output at start-up: Nichia 519A : 3800lm Nichia E21A : 1200lm SST-20 6500K/5000K: 4200lm SST-20 4000K/2700K 95CRI: 3000lm This product uses free software distributed under the terms of the GPLv3. The Mule version is with 8*LEDs, no optic, no aux LEDs, no hotspot, completely flood. For the general users, we recommend to choose regular version (with aux LED, optic etc) instead of the mule version. (send us an email to contact@intl-outdoor.com if you need the mule version) 
Customer Reviews
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CHRISTIAN
Great light September 23, 2022
Nice flashlight. Ordered 2700k. Very nice. Stands out from usual 4000k plus lights. Will definitely order more variants
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Audrey
If you don't know the legend of the d4v2, you've been living under a rock. April 19, 2021
Can it burn your house down? Yes. Can it light up a large room like the Sun? Yes. Can it give you second degree burns? Yes. Is it the most powerful single cell flashlight in production? Yes.
Tldr; if you didn't come here from the forums and don't know enthusiast lights work, please don't buy this. You will hurt yourself. If you know what you're doing and know how to use this safely, then it's absolutely one of the best flashlights ever made. -
Fred
Very good flashlight November 18, 2020
This flashlight in brass is so pretty. Its super shiny upon arrival but only after a couple of days it has begun to patina. It will look very cool with a worn look.
I chose XPL-HI 2850K which was super bright with a warm color. Looks like sunlight in the afternoon.
Very happy with my purchase. -
Tim (Ger.)
A piece of craftmanship December 20, 2019
The Lamp is pretty heavy due to the material wich is massive brass and haptics are impressive.
The processing is very well done and all edges are boned.
Valued it has at least tripple the weight as its counterpart made from aluminium. The finish is very shiny due to the material and looks attractive and distinguished.
Iam pretty happy with flat retaining ring and warm white backlite of the switch. I choosed the XP-L HI in 4000 K which emits a convenient beam and good color reproduction.
The UI has a lot of features and fits the light perfectly with no wishes left. Once youre used to it you will miss it on other flashlights.
The only point of criticism is the slightly uneven brightness of switch backlight leds in low level.
Price is reasonable for given quality.
To me its a piece of craftmanship and fullfilled my high expectations. Respect Mr. Wang.
Yours truly
Tim (Germany, 20.12.2019)
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Product Questions
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